<div class="todolist-add-container">
  <nz-input-group nzSearch [nzAddOnAfter]="suffixButton">
    <input type="text" class="custom-input" [(ngModel)]="todoText" (keydown.enter)="addTodo()" nz-input placeholder="新增代办事项……" />
  </nz-input-group>
  <ng-template #suffixButton>
    <button  class="custom-button" (click)="addTodo()">提交</button>
  </ng-template>
</div>
